Roundover bit R3 with guide bearing

The RUWI R3 roundover bit rounds off wood edges with a 3-mm radius—creating a subtle, practical rounding: barely visible, but clearly noticeable where a sharp edge would be bothersome. The guide ball bearing (Ø 12.7 mm) runs along the edge of the workpiece and guides the cutter even along curved contours for which no fence fits.

The router bit is double-edged and carbide-tipped (HW, Z2), right-hand rotation, with Ø 19 mm tool diameter and 10 mm working length; shank Ø 8 mm, overall length 56 mm. It cuts softwood, hardwood, and laminated panels. If the ball bearing wears out, you can replace it—instead of replacing the entire router bit.

Here's how to use it

• Countertops and window sills: The 3-radius design eliminates the sharp edge without altering the clean lines of the surface.
• Break edges before oiling and varnishing: the slight curve keeps the oil and varnish layers on the edge, where sharp edges would let them break through.
• Freehand use on installed furniture: the compact Ø-19 head runs smoothly when guided by hand—ideal for touch-ups on the job site.
• Batch processing on the table: On the router table, you guide the workpiece past the stationary milling cutter—edge by edge, with the same profile.

Does this fit your router?

The shank requires a collet Ø 8 mm – standard on the RUWI router table; it is also compatible with hand-held routers, bench routers, and CNC machines. The compatible tables are shown in the RUWI router tables.

R4 to R12.7 for stronger rounding; R2 is even finer—the whole range is shown in the overview of RUWI milling tools.

All the details

Profile
Radius: 3 mm
Tool diameter: Ø 19 mm
Working length: 10 mm
Overall length: 56 mm

Shank and guide bearing
Shank: Ø 8 mm, shank length 32 mm
Guide bearing: Ball bearing Ø 12.7 mm, replaceable

Cutting edges and use
Cutting edges: Z2, carbide (HW), clockwise rotation
Materials: Softwood, hardwood, coated panels
Collet: Ø 8 mm required
Net weight: approx. 31 g